Automatically (re)order include directives (GTK client) (#4475)

* Automatically (re)order include directives (GTK client)

Include our headers first to ease IWYU enforcement.

* Fix includes missing from headers (GTK client)

* Fix build on Mac after includes reordering

gtk/PrefsDialog.h

@@ -5,11 +5,11 @@
 
 #pragma once
 
-#include <memory>
+#include <libtransmission/tr-macros.h>
 
 #include <gtkmm.h>
 
-#include <libtransmission/tr-macros.h>
+#include <memory>
 
 class Session;